See below from an old thread.
So what actual problems are you having on your service, on what devices and does it happen on ethernet connections as well as wifi ones?
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RCS (Receive Channel Set) Partial Service. The hub ‘knows’, for example that it should have 24 bonded downstream channel but for some reason, generally noise or interference, it is unable to properly lock onto one or more of them. If this happens then rather than the hub simply going offline, it carries on with a slightly degraded service - which may or may not even be noticeable to the user. If and when the conditions improve, the hub will recover it’s full service although this isn’t logged. Getting some of these infrequently is not uncommon and can usually be ignored.
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John
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I do not work for VM. My services: HD TV on VIP (+ Sky Sports & Movies & BT sport), x3 V6 boxes (1 wired 2 WiFi,) SH2 in modem mode with Airport Extreme Router +2 Airport Express's. On VIVID200, Talk Anytime Phone, x2 Mobile SIM only iPhones.